Pump construction



Aug. 7, 1945. c. 1 LONGENECKER 2,331,220

' I PUMP CONSTRUCTION Original Filed May 28, 1942 v 2 Sheets-Sheet l ,c.I; LONGENECKER 2,381,220 I PUMP CONSTRUCTION Original Filed May 28, 1942ZSheets-Sheet 2 Patented Aug. 7, 1945 UNITED STATES PATENT OFFICE PUMPCONSTRUCTION Charles I. Longenecher, Wauwatosa, Wis, as-

signor to Chain Belt Company, Milwaukee, Wis., a corporation oiWisconsin Original application May as, 1942, Serial No.

444,891. Divided and this application July 16,

1943, Serial No. 494,990

3 Claims. (Cl. 103-113) The invention relates to pumps, and moreparticularly to centrifugal self-priming liquid pumps oi" the generaltype referred .to in prior U. 8. Patents No. 1,989,061, granted January22, 1935; No. 2,022,624, granted November 26, 1935; and No. 2,217,380,grantedOctober 8 1940; and it has for one of its principal objects theprovision of an exceptionally light weight pump constructed largely ofsheet metal to facilitate portability but which at the same time willwithstand wear remarkably well when handling dirty or gritty liquids andwhich can be quite easily disassembled and reassembled, for inspectionand/or repair in case of necessity,

with the aboveand other objects in view which will appear as thedescription proceeds, the in- Figure 1 is an end elevational view of apump constructed in accordance with the invention, with a .prime moversuch as a small internal combustion engine associated therewith fordriving it;

Figure 2 is a side elevational view, on a slightly larger scale and witha portion of the pump body or casing broken away and in section, of thepump sheet metal strip or ring I5 which is welded at its edges to thesaid flanges as indicated in the drawings. Angle members It and il eachhave one 1 vention resides in the novel details of construc- ,tion,partsand combinations of parts more fully ,branch is utilized for theintroduction of water body l0 constituting a delivery and priming waterchamber and having a pair of spaced heads or end members Ii and I2 whichare preferably formed by stamping or drawing disks of sheet metal toprovide peripheral flanges II and I4 respectively. The 'said heads arespaced-as shown and their flanges l3 and H are surrounded by a of theirlegs welded to the strip it while their other legs are welded to abridge member II and constitute a foot or base for the pump as will bereadily understood, and an outlet tube or pipe 24 extends through thring member II at its upper part, being welded thereto and communicatingwith the chamber within the casing to constitute a conduit through whichthe liquid is discharged from the pump. This outlet conduitis-preferably provided with an angularly disposed branch 2i normallyclosed by a threaded plug 22, which into the casing chamber to initiallyprim the pump before starting it into Operation.

An impeller chamber 24 is also provided within the casing l0, beingcarried in whole or in part by the head l2 and comprising a stripiofsheet metal 25 curved to spiral or volute form and having one end 28welded to the flang i4 of the head l2. Said strip is also welded alongone edge-to the head l2 throughout substantially its entire length whileits other edge is welded to a vertlcal partition plaM'l'positlonedsubstantially in the plane of the inner edge of flange i4, as will beclear from Figure 3. The said plate 21 is provided with a centralopening 28 through which shown in Figure 1; asseen from the left oi saidFigure 3 is a central sectional view, taken approximately on the planeindicated by the line 3-4 of Figure 1, looking in the direction of thearrows;

Figure 4 is a sectional view taken approximately on the planes indicatedby' the line 4-4 of Figure 2, looking in the direction of the arrows;

Figure 5 is a similar view taken approximately on the plane indicated bythe line 5--5 ofFigure 2; and

Figure 6 is an expanded perspective view, partly the liquid may enterthe impeller chamber 24; and an annular flange 29 is welded or otherwiserigidly secured to the said partition wall for a purpose to be laterdescribed.

The head or end plate l2 is-provided with a relatively large circularopening 30 through which the pump impeller 3i may be introduced into theimpeller chamber 24, as will be readily understood from Figures 3, 5 and6. The said in section, illustrating the several elements andsubassemblies of the pump in their relative positions or order inassembly or disassembly.

Referring more particularly to said drawings impeller as here showncomprises a sheet metal disk 32 welded to a central hub 32 and having aplurality of impeller blades 34 edge welded thereto as will be clearfrom Figures 5 and 6. The

hub 33 is threaded or otherwise detachabl secured upon a shaft 35, hereshown as being the end portion of the power shaft of the internalcombustion engine E illustrated in Fig. 1. The said shaft extendsthrough a member 28, constithe pump as here shown comprises a casing orso tilting .8 portionof the frame or casing of the said engine, andthrough a tubular housing 31 which has the annular flange members 38 and39 welded to its respective ends. The flange 38 is of suflicientdiameter to close the opening 30 in ,the head l2 and is normally securedin position members are rigidly secured to them. They are also quiteresistant to wear and thus .contribute to the long life ,of the pump.

carries the stationary member 4| of a sealing structure, which alsoincludes a rotatable sealing ring 42 engaging the end face of the member4! and driven by the bent arm 42' from the impeller plate 32, see Fig.3. A packing ring 43, of rubber, fibrous 'or other suitable material,also surrounds the shaft 35 and assists in preventing the escape ofwater from the pump and grease or other lubricant thereinto. The flange39 is secured to the engine frame member 36 by screws or bolts 44.

The opposite head ll of the pump casing is I also provided with arelatively large central opening 45 which is normally closed at least inpart by a disk 46 of an inlet valve assembly, such disk being detachablysecured in place by nuts and bolts 41, the latter of which are tackwelded to the head II to be permanently carried thereby. The

disk 46 has an inlet conduit or nipple 4B welded to its central portion,extending outwardly therefrom; and a second conduit 49 is welded -to andextends inwardly from its opposite side. This last tube or conduitconstitutes a support or seat for an inlet check valve 50 of the flaptype, which is secured to and supported by a strut welded to and rigidlycarried by th member 49.

Surrounding the inlet check valve 50 is a tubular member 55 whichextends from the disk 45 of the inlet valve assembly to the annularflange 29 carried by the partition wall 21, as clearly indicated inFigs. 2 and 3. Th inner end of this member 55 has a sliding fit uponsaid flange 29 and a rubber or other resilient washer 56 is interposedbetween the end face of the member 55 and the partition wall 21, as willbe readily understood from Figs. 3 and 6.

The tubular member 55 constitutes a. conduit for conducting the incomingliquid from the valve 50 to the inlet port 28 of the impeller chamber24, and it also serves to support a valve for controllin the admissionof priming water from the delivery and priming water chamber to theinlet port 28 of the impeller chamber. That is to say, the said member55 is provided with a laterally extending passage 60 having a port 6|affording communication between the delivery and priming water chamberand the interior of the member 55, which port is controlled by a primingwater valve 62, which is or may be of the type disclosed and claimed inthe prior U. S. Patent, No. 2,217,380 referred to above) As best shownin Figs. 4 and 5, the end of the volute strip 25 opposite its rigidlyattached end 26 is preferably folded back upon itself as indicated at 65and has removably attached to it, as by the screw 66, a peeler element61, the sharpened edge 88 of which co-operates with the periphery of theimpeller 3| in a manner fully disclosed in the prior U. s. Patent No.1,989,061

mentioned above. I

With'the exception of the member 55, whichis here shown as a casting,the various other tubur181 elements heretoforedescribed preferably takethe formof short sections of standard seamless pipe, 'which are not onlyrelatively inexpensive but also lend themselves quite well to thewelding operationssghereby the various disks and other as justdescribed, by welding the flange 29 to the partition plate 21, weldingthe end 26 of the volute strip to the flange l4 of the head, and edgewelding the said strip to the head, after which the partition member 21may be welded to the other edge of the said strip. Th members l6, l1 andit are welded together and to the outside of the'casing to constitutethe base or support for the pump, and the outlet conduit 20 ispositioned and welded in place.

The impeller assembly is assembled as a separate unit, as is also theinlet check valve assembly, and the tubular intake conduit 55 and itspriming control valve 62. With the various sub-assemblies thus completedthe pump may be completely assembled by introducing the impeller 3|through the opening in the head I2 and securing the flange or disk 38 ofthe impeller assembly housing to the head by means of the screws andnuts 40, a packing gasket or washer 69 being preferably interpostedbetween the said disk and head.

The packing washer 56 is then introduced through the opening in the headI I and positioned on the flange 29, whereupon the tubular member islikewise inserted through the opening 45 and its end engaged upon thesaid flange 29 which serves as a positioning guide and support therefor.Theinlet check valve assembly is then brought to position and its disk46 secured to the head II by the nuts and bolts 41, a packing gasket 10being interposed between the parts as will be readily understood. Thisgasket is pressed against the adjacent end of the tubular member 55 asthe nuts on the bolts 41 draw the disk 46 home and firmly presses thesaid tubular member against the sealing gasket or washer 56, thusretaining the said tubular member in the operative position shown inFigure3.

If desired the head ll may be provided with a short sleeve H to providea drain opening for the pump chamber, which ,opening will of course benormally closed by a plug 12.

It will be clear from the foregoing that the present pump is constructedfor the most part of sheet metal elements and of standard seamless pipesections and it is therefore not only relatively inexpensive tomanufacture but is highly resistant to. wear and very light in weight sothat it may be readily transported from place to place.

Having thus described the invention what is claimed is:

l. Awelded sheet metal casing assembly for a recirculating self-primingliquid-handling pump, comprising an outer perimetric wall provided witha discharge port; a pair of axially spaced of one of said heads, saidstrip being radially spaced throughout at least a major portion of itslength from said outer wall, and having its outer end disposed in thevicinity of the discharge port of the outer wall; and a sheet metalplate hermetically secured to the, other edge of said volute strip toprovide an end wall for said impeller chamber spaced from the othercasing head.

2 A sheet metal casing head assembly for a rotary liquid pump,comprising a plate having an Opening for'the introduction and withdrawalof an impeller, said opening being spaced from the perimeter of theplate; an impeller chamber wall projecting from one face of said plate,comprising a volute strip of sheet metal having one of its edgeshermetically secured to said plate,

said strip partially surrounding the opening in the plate and extendingspirally therefrom-to adjacenththe perimeter of the plate; and a sheet20 metal plate having an inlet port for said impeller chamber,hermetically secured to the other edge of saidstrip to form an end wallfor the chamber.

3. A casing head for rotary liquid handling pumps, comprising aperimetrically flanged sheet metal plate having an opening for theintroduction and withdrawal of an impeller; a volute strip of sheetmetal partially surrounding said opening and extending spirallytherefrom to the plate flange, said strip being welded along one of itsedges to an inner face of said plate and at one end to the flangethereof, to constitute a perimetric wall of-an impeller chamber; and asheet metal plate having an inlet port for said chamber, welded to theother edge of said stripto form an end wall for the chamber, said platehaving an annular flange surrounding said inlet port for positioning andsupporting a conduit member for supplying liquid to said port.

CHARLES I. LONGENECKER.

